Crime Scene Practice Investigation Kit
First- An important note about your Crime Scene Investigation Kit. DO NOT ASSUME you will see something at the tournament because it was included in this kit. This supplemental study material IS NOT part of the event rules. Be sure youre using the current rules, and watch the FAQs on the website. Check the Crime Buster event page on the website for additional information and study materials:
Macomb Science Olympiad Crime Scene Investigation Kit Version 2017.0 Page 1 of 7
Practice safety !!! You will be required to wear splash proof safety goggles at the tournament. Get in that habit during your practice. Most of the materials included in your kit can be found in your kitchen,but in a lab you cant be certain what any substance is. You dont touch it,don't taste it, don't sniff it. (If you do, you will be disqualified at the tournament)
No eating or drinking in the lab. This means no gum, cough drops, holding a pencil in your mouth, etc.Your kit does include iodine and rubbing alcohol- treat with due respect.
Your kit is designed to help you practice for this Science Olympiad event
while being supervised by youradult event coach.
You may also want this
Your Kit contains this
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Powders:o Alka-Seltzero Baking Sodao Corn Starcho Flouro Gelatino Granulated Sugaro Yeasto Salto White Corn Mealo Calcium Carbonate
Chemicals and materials for testing powders:o Iodine (4 oz.)o Rubbing Alcohol (16 oz.)o Vinegar (16 oz.)o Black Paper (2 sheets)o Droppers (3)
o Chromatography Paper (5 cm by 10 cm, 16 pieces)
o Ink Pad (1)
o Magnifier (1)
Toothpicks, for examining powders without touching them.
Small plastic cups, to hold powder samples.
Splash-proof safety goggles to use during practice and at the tournament.
A wide-bottomed glass for chromatography.
Five different ink pens or markers. They should be similar colors.
These important items ARE NOT included in your kit:
The Kit contents are what you
need to prepare for the
An extra zealous crime lab may
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The purpose of using your magnifying glass to examine sampleson the high contrast black paper is to see the shape of individual particles making up the collection of powders.
To set-up a practice, the coach should mix up to three powders in a small, plastic cup. This will be the crime scene sample. The total sample size should be 10-15 grams.
In five other cups, mix up to three powders, keeping in mind that at least one of these cups must match the powders from the crime scene sample.
Students will pour some of your powder sample onto the black paper and use yourmagnifying glass to get a better look at it. Remember that touching the powders is not allowed. (You will be disqualified at the tournament if you do )
Do not add liquid to the powders while on black paper.
Make sure to transfer some of your powder sample to another cup before adding a liquid so you dont waste all of it!
Use one of each of the droppers to transfer water, vinegar, and iodine onto your powder samples, again keeping in mind that you may not touch the powders or liquids.
When youre using you droppers to conduct your tests, be sure you:
Dont cross contaminate by using the same dropper for different chemicals.
Do not allow the dropper to contact the sample. Allow the reagent (the chemical youre testing with) to drop onto the sample.
As a general rule for all liquids, they should be added to powders (instead of adding powders to liquids) and poured slowly and carefully to avoid a mess.
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The purpose of the iodine test: adding it to powders to look for colorchanges (it usually changes red, brown, or bluish black, and sometimes yellow). It helps distinguish between some very similar powders, like corn starch and powdered sugar.
The purpose of the water test: to see if a powder dissolves with water added, absorbs the water, or if the water rolls off of it.
On the left side of one of the 5 centimeter edges of the paper, write a small dash with one pen. This will be your crime scene ink sample.
Add marks from four other similar (not identical) pens, and make an additional mark from the crime scene pen.
Students will use the prepared sample to identify which (if any) of the five pensmay have been used to make the crime scene sample mark.
Use a piece of the Chromatography paper from your kit to set this up:
First mark is your Crime Scene sampleplaced here by the coach.
Other marks are for comparison to the Crime Scene sample.(One of these marks was also made by the crime scene pen)
Be sure you dont spill iodine on skin or clothes; it will stain both. Pay attention to warning labels. Remember that there is no tasting or touching of event materials allowed.
Purpose of the vinegar test: vinegar reacts with some powders (most apparently with baking soda).
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Fill the bottom of a wide cup with rubbing alcohol (This will be done for you at the competition).
Tape the edge of the filter paper opposite to the dashes to a pencil or other long narrow object (or push the pencil through a punched hole in the filter paper) and lay it across the top of the cup.
The marked edge of the filter paper should just touch the surface of the rubbing alcohol like shown:
The purpose of the chromatograph is to tell if two samples of ink came from the same pen.
It can be fun to try chromatography with different kinds of pens and markers to see what designs you get!
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Be ready for anything
On Tournament Day...
Since youve carefully studied the rules (always available on the website) youvenoticed unspecified evidence listed as part of the competition.
There may be a blurry photo of one of our suspects, or a poorly lit video.Maybe pieces of torn clothing were left at the scene. Maybe a security system captured a retinal scan. Possibly an incriminating sound was recorded during the crime.
This may be the most difficult part to prepare for, but it makes the competition even more exciting.
Practice being very careful observers and logical thinkers. Dont let the pressure ofthe tournament cause you to jump to an incorrect conclusion!
The official rules (available on the website) are very specific about what your team cannot bring to the competition, and what they can (and probably should) bring.
They can bring a magnifying glass and a 8.5x11 chart front and back with any notes. They must bring writing materials and splash-proof goggles.
Different types of prints will almost certainly be found at the crime scene.
Your kit includes an ink pad to help you get started experimenting with footprints.On top of fingerprints, the Student Forensic Scientists will also have to analyze shoe prints and tire tracks. The "unspecified evidence" portion of the test could also include bare foot tracks, animal tracks, or something more unusual.
Some prints may be obscured or partial. Practice being a careful observer.
Watch the website after the extravaganza for more practice material.
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Some other tips
What to do if you need more iodine
Where can you get safety goggles?
Where can you get more chromatography paper?
What to do if you need more alcohol
What to do if you need more vinegar
Where can you find other practice activities?
Watch the Crime Busters event page on the website for new information and links to other activities.
Your kit contains Pvp Povidone Iodine Disinfecting Solution. You can find similar products at most drug stores. Be sure you dont spill iodine on skin or clothes; it will stain both. Pay attention to warning labels. Remember that there is no tasting or touching of event materials allowed.
Students will be required to wear splash proof goggles at the tournament. This is a good habit to get into during practice. Theyre inexpensive, and available at most hardware / home improvement stores.
Your kit contains 70% isopropyl alcohol, available at most drug stores. Be sure you dont taste or sniff it.
The vinegar in your kit is distilled white vinegar 5% (table strength). Dont use Balsamic or Apple Cider vinegar. Although this is food, in a l